Discuss bench mounted pillar drill running at a reduced speed even when its not under load in the Electrical Forum area at ElectriciansForums.net

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paulthemagpie

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hi guys,

We got a bench mountepillar drill, which is running at a reduced speed even when it is not under loadconditions.
what could be the fault?

 
D

Deleted member 26818

Re: bench mounted pillar drill running at a reduced speed even when its not under loa

Seized bearings, incorrect voltage, worn brushes, damaged windings, incorrect gear selection, worn drive belt......
 
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paulthemagpie

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Re: bench mounted pillar drill running at a reduced speed even when its not under loa

i was thinking its going to be more on the lines of the reduced voltage causing it.

if it was three phase id say maybe a phase is down.

what could it be on single phase to reduce the voltage
 

Geordie Spark

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Re: bench mounted pillar drill running at a reduced speed even when its not under loa

i was thinking its going to be more on the lines of the reduced voltage causing it.

if it was three phase id say maybe a phase is down.
would it even start??

what could it be on single phase to reduce the voltage
Voltage drop .... how long & what Cross Sectional Area is the cable feeding the workshop / drilling machine?
Just a couple of suggestions of the top of me heid bonny lad. :)

(could be complete bow locks of course)
 
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MarkieSparkie

Re: bench mounted pillar drill running at a reduced speed even when its not under loa

Loose or incorrectly tensioned drive belt the most likely.
 

snowhead

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Re: bench mounted pillar drill running at a reduced speed even when its not under loa

Is this a real or hypothetical drill?

If it's real;
Reduced voltage is the most Unlikely cause.
Mechanical faults would be the most likely.

Is it making any noises?
Does the chuck shaft spin freely with the belt off?
Does the motor speed vary by much with the drive belt on and off?
Is the belt loose?
Is the belt tight?
Does the motor have built in brake?

Then move on to electrical faults.
If it's 3 phase it will start on 2, the motor has no load on it.
What's the incoming voltage/s at the switch?
Same again at the contactor if fitted.
And more..
 

Guitarist

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Re: bench mounted pillar drill running at a reduced speed even when its not under loa

I'm guessing that it's a question for one of your papers?
 

ruston

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Re: bench mounted pillar drill running at a reduced speed even when its not under loa

I'm guessing that it's a question for one of your papers?[/QUOTe

If it is the answer will be in the material that you have already covered , they will not expect you to know that which you have not been taught; unless you have been given an assignment that you have not done lol.
 

ian.settle1

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Re: bench mounted pillar drill running at a reduced speed even when its not under loa

i was thinking its going to be more on the lines of the reduced voltage causing it.

if it was three phase id say maybe a phase is down.

what could it be on single phase to reduce the voltage
As you are the person starting the thread surely you know if it is single or three phase drill?

As geordie spark said it would not start if it was a phase down
 

Geordie Spark

Regular EF Member
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Re: bench mounted pillar drill running at a reduced speed even when its not under loa

Is this a real or hypothetical drill?

If it's real;
Reduced voltage is the most Unlikely cause.
Mechanical faults would be the most likely.

Is it making any noises?
Does the chuck shaft spin freely with the belt off?
Does the motor speed vary by much with the drive belt on and off?
Is the belt loose?
Is the belt tight?
Does the motor have built in brake?

Then move on to electrical faults.
If it's 3 phase it will start on 2, the motor has no load on it.
What's the incoming voltage/s at the switch?
Same again at the contactor if fitted.
And more..
Aye, but the motor does have a load on it. It will have the load of the drill spindle & the drive - belt or gearbox - connecting the motor shaft to the drill spindle.
 
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